Add support for `rust` language

[data-douser]

Use the .github/skills/add-mcp-support-for-new-language/SKILL.md agent skill as a guide to fully supporting the rust language via the primitives of the codeql-development-mcp-server, including support for all standard "tools" queries with valid and non-empty query unit tests.

Use the following links for CodeQL's Rustaceous documentation.

• docs/codeql-language-guides/basic-query-for-rust-code
• docs/codeql-language-guides/codeql-library-for-rust
• docs/codeql-language-guides/analyzing-data-flow-in-rust
• codeql-queries/rust-built-in-queries